Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1984-03-19
1987-05-26
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
92167, F15B 910
Patent
active
046675680
ABSTRACT:
A pull-type booster for a vehicle includes a main body having an internal space; a movable body including a head portion and a cylindrical portion formed integrally with the head portion, the head portion being arranged in the internal space and partitioning the internal space into a lower pressure chamber at one side and a control chamber at another side, and the cylindrical portion projecting from the main body at the other side; a through hole formed in the movable body; a pull input rod extending across the lower pressure chamber and projecting through a seal assembly from the main body at the one side; the seal assembly including a seal member fixed to the main body at its outer circumferential portion and fitted to the pull input rod at its inner circumferential portion; a more flexible portion formed between the outer circumferential portion and the inner circumferential portion in the seal member; a plunger arranged slidably in the through hole and combined with a head portion of the pull input rod; a valve member arranged in the through hole and operated by the plunger for generating pressure difference between the lower pressure chamber and the control chamber and moving the movable body in the direction of the lower pressure chamber; power transmission members arranged in an opening end portion of the through hole and engaged with the plunger means, and a pull output rod engaged with the power transmission member and projecting outwards from the cylindrical portion of the movable body.
REFERENCES:
patent: 1583117 (1926-04-01), Bragg et al.
patent: 2305265 (1942-12-01), Tourneou
patent: 3096689 (1963-07-01), Kytta
patent: 3410179 (1968-11-01), Kytta et al.
patent: 3754450 (1973-08-01), Putt et al.
patent: 3901518 (1975-08-01), Uchida
patent: 4251050 (1981-02-01), McInerney
Garrett Robert E.
Nippon Air Brake Co., Ltd.
Ryther James P.
Williamson Mark A.
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